According to website CVG, Blizzard Entertainment is currently working on the next expansion (number 5) after Mists of Pandaria while the next-next expansion (number 6) is already being pitched and planned. To add on, Blizzard COO Paul Sams claims to know what the team will be doing for not just these 2, but for "multiple expansions ahead". Hit on the source for the full article. World of Warcraft: Mists of Pandaria is currently in the Closed Beta phase.
"I got the pitch from Chris Metzen of what they plan for 6.0 and I'm pretty geeked up about it. They already know what they're going to be doing for multiple expansions ahead."
"They have an idea - a general framework. They're these lore creators. They're the ones who drive what the world looks like today and what it'll be like tomorrow and beyond."
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